如何在PHP中添加多维数组的值？

Question

问题解决了，谢谢：

foreach($FIMP as &$value){
    foreach($value as &$values){
         $values[0]=$values[3].$values[2].$values[1];
}

我有以下数组：

$FIMP=array(
    1 => array(
             1 => array('a','b','c')
             2 => array('a1','b1','c1')
    2 => array(
             1 => array('a2','b2','c2')
    3 => array(
             1 => array('a3','b3','c3')
             2 => array('a4','b4','c4')
             3 => array('a5','b5','c5')
)

我想添加值：b和c并用'bc'结果覆盖a

$FIMP=array(
    1 => array(
             1 => array('bc','b','c')
             2 => array('b1c1','b1','c1')
    2 => array(
             1 => array('b2c2','b2','c2')
    ...

我已经尝试过$ FIMP

foreach($FIMP as $value){
    foreach($value as $values){
         $values[0]=$values[3].$values[2].$values[1];
}

}

在输出中，先前的$ FIMP不变，

Answer 1

<?php

$FIMP=array(
    1 => array(
         1 => array('a','b','c'),
         2 => array('a1','b1','c1'),
    ),
    2 => array(
         1 => array('a2','b2','c2'),
    ),
    3 => array(
         1 => array('a3','b3','c3'),
         2 => array('a4','b4','c4'),
         3 => array('a5','b5','c5'),
    ),
);

foreach($FIMP as & $v1){
    foreach($v1 as & $v2){
        $v2[0] = $v2[1].$v2[2];
    }
}

var_dump($FIMP);

Answer 2

您可以这样做：

  foreach($FIMP as &$first){
       foreach($first as &$second){
            $second[0] = $second[1].$second[2];
       }
  }

输出值

Array
(
[1] => Array
    (
        [1] => Array
            (
                [0] => bc
                [1] => b
                [2] => c
            )

        [2] => Array
            (
                [0] => b1c1
                [1] => b1
                [2] => c1
            )

    )

[2] => Array
    (
        [1] => Array
            (
                [0] => b2c2
                [1] => b2
                [2] => c2
            )

    )

[3] => Array
    (
        [1] => Array
            (
                [0] => b3c3
                [1] => b3
                [2] => c3
            )

        [2] => Array
            (
                [0] => b4c4
                [1] => b4
                [2] => c4
            )

        [3] => Array
            (
                [0] => b5c5
                [1] => b5
                [2] => c5
            )

    )

)

Answer 3

从PHP foreach文档中 ：

为了能够直接在循环内修改数组元素，在$ value之前加＆。 在这种情况下，该值将通过引用分配。

因此，要更改$FIMP的值，您需要将foreach循环更改为以下内容：

foreach($FIMP as &$value){
    foreach($value as &$values){
         // alter $value or $values here
    }
}